With 1. I think it depends on intent. For example when Tesla purchased BTC before announcing they were taking payments to have some liquidity on it for financia

With 1. I think it depends on intent. For example when Tesla purchased BTC before announcing they were taking payments to have some liquidity on it for financial reasons or whatever, then it's ok. If you can prove they are front-running the market because for example right after announcing they are listing a coin they dump what they got before listing it then yeah maybe that's insider trading. The thing is if they take enough measures to prevent their employees from doing it. It's hard considering they can do it on another exchange, but at least on their own exchange my understanding is they should prevent their employees from trading if they have privileged information.